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Abstract

The formulations are presented for the thermodynamic properties of moist air at temperatures from −40 to 400◦C, humidity ratios from 0 to 1 kg/kgda, and pressures ranging from 5529.3 Pa (20-km altitude) to 2 MPa. Moist air is modeled as a real gas using the virial equation of state. Up-to-date values for the virial coefficients of both air and water vapor are used. Equations are derived and results are presented for humidity ratio, specific volume, enthalpy, entropy, wet and dry bulb temperatures, relative humidity, and compressibility. Saturation data are presented for humidity ratio, specific volume, enthalpy, entropy, and compressibility. Results are presented in tabular and graphical form. This work extends the current moist air data to higher temperatures, higher humidity ratios, and a larger range of pressures.